A multivariable model was constructed to predict the eGFR beyond 3 months after RN (Table 2, Supplementary Table 1): postoperative eGFR ~ Intercept + age + preoperative eGFR + rGFR of the operative side + rGFR of the healthy side + serum cystatin C + diabetes + surgical method + TFS + preoperative eGFR × TFS + rGFR of the healthy side × TFS + serum cystatin C × TFS + surgical method × TFS. Here, CST3 is linked to diabetes mellitus.